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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23807142b31cd77fd4ba949310b26fec6406e6d0d19435d9fc4c26db0be775fa' 
  AND token = 'rL2/drFABx6iRBbqH5AYYfTxweSJBDWh/9hp/DueND8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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