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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f007b4d879c82d714a36f625e8ce3991c94828569bd859e2abe7d9836b467cb9' 
  AND token = 'JcGDAEyj1SLOnAMBJAZKX9J7Rk9LAkXWlVDtEKK5v0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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