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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18380be3dc1e63d38fe64ff4e96adcedc1ad74fc21c8b06fb2dc1aa8bc40c6d4' 
  AND token = 'qjXIk8x0XTUgPvyQV7bf6MtqLblkAoJtPbPb8JIaDno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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