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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01b930d038c33a24b5808ca2ef97b5cfc69018fe5aebf207e9c484ad474f5517' 
  AND token = 'i5L59cAzI+qqzjsaXZ1L6ujM6iy2qFgdRrIJKOcvDMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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