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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed77a47c60c4b339c1bb94fb290d717a46682dd23877ace5ad8c970822739079' 
  AND token = 'TT1iWfHnZ54A7DGaswvnd0QR4Gxn8RsmUoeqAAH7VxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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