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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db1efe244f71ad730a074139052cb3670bb14c5784f4ab43eddbc0e69ffe82c' 
  AND token = 'kEkz+ukXMwewQsoahVbjTMUzfNXDcLr87L1tGVUzm8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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