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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97b62ce937622fde80b6d997368bfdccc892e3149c16e7e10188f53c337fa67' 
  AND token = 'wTNFeQhnAhLhqkgFtHK3wvwVHfTes71TtBpfmrq59DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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