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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '454296f307909f0cf05be5e7179a67e82bcc6839c1fdc3c240d8c64b1ccf43b9' 
  AND token = 'oqditAagVjZBU5tuE3Rk6tKHxCOjKG7K8Wn/jVoetb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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