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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ccd0f30f829936e671778ba57e69ef29608c820ee608931e3adeaa98ec004b' 
  AND token = 'zb3jBYtFLJ+YIQo6mx+qA/p0w16ES1m5V6Z9WedObVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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