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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731743e730912ccb656bc39b3edc576cb0df360f56c4d45ae642d6f6906ec5b2' 
  AND token = '4NxK5XDXooDu+SXzK4p0T+jMAC8IJLp6eHSlTa4WN04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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