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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97cf191964090d60f3a76f1d829a31bd78c58232a2f72f2d02fad5655980989' 
  AND token = 'UcdUGLFTphfoTPjsXLXTUU0vIT6UBI5ui2eaketbth0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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