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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688d15aed3493cd9184e9aba0a7169664ed27e1318cea8bef1f4182c73a8ca48' 
  AND token = 'BYNge5M9wQRpyObLQ0iuBMdoncVVo7y7jlB8wHllY24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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