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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdfd8407c0525ceca6c8700ee6db74177e427d23ba96be7f3c05f75c5cd27a98' 
  AND token = '9XKyQLSGq4ndnhbQtRyQ7s2bu6SaRF6OyCAtgphHD34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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