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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa1bc1638df09384927f42840b3d9f79223aca399a37648ae1762b8fd3a6b17' 
  AND token = 'kO6gy9W0t690050tDe7c33A7g8JMekUgV3RBAp6iXoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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