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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20a5dc99fbf0d8df4381aa061a0230764045d34406349ac0fa8a5588c899dd6' 
  AND token = 'BqeXQTEj1xlSlyrF0YwtFNUUadnqWzLpo9TsMXpt4GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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