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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c8e300bc85cafc4d7e09ad9bfb7d70d3f2314e2bb28445d353ba52672a055a' 
  AND token = 'B4Ih6LaZhqMdXT2sPemYbpA04jqpnmshWnkOeZTvOwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}