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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3c9701d18fb30b61bd84abf42455b310d0e7c267a40c861eac8f35ee01cb22' 
  AND token = 'z/ERiC9WPdkCKAkdYXU4hUSQytxddIoVAGc82GeoSXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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