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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa47c41c7c3cee1845f6362cd0b01d66ad525c702fcbd9d64d706e6dd44c8e7' 
  AND token = 'IIuXYArh/oL+5iiwmKBfz7A9CZ4EAY96FsV7j6epPgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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