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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa94d7fdee9dea3a4402e35ecc7fddcc51dc614419da23335e53f7101bb6107e' 
  AND token = 'WPz4GbXeu6zIyk9ZUOdxoHskScDIhsdfxAeSUYux9bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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