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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce1ad44f457b081873cc7a8651cce3ef6860032a64fbf93b2b86cd06557c1856' 
  AND token = 'GgtkwvdPZGeliF6aAJPock25gkqDuXH2QQ4nObzQd9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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