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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4da234301a30fcc85b6d121a5120dabfb55c6a8b0240510c2f9c1e05e2a66c4' 
  AND token = 'cImCLiPHsm4tePTNy5ASeNfqByw5dDIeJC2JxqO7VlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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