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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70765b2049a74da7c93d94d1471a37b4ad2ba65c53d37e50f04aeaf584d3f2e' 
  AND token = '/VwDf19kZeo92rmub6RLnDknRSZ/y7J3i/8xA38Czwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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