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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237496323bb269be0fcbf2b01040277a5e9f3cb8280980f0fb0e661d38d3ec92' 
  AND token = 'er7wV1VT1c15y7CSd/QDuZGbt6f/VSxp6A9yPOhdQAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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