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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4baf7518c95801bb71ec38a16c0b5883edb6cea976eda1197f28c121f4650f' 
  AND token = 'TyngV6wAr2hKOEqlWfps3GORoRaZWCdRoZkl14Wc0ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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