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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d128dbf8bc8ec01e76d75d85056f3ba893122e95b628fc03b7adf57d02dfe0' 
  AND token = 'gzIxR4Ki9kZ46Gsh+UWU9QcDPhBf0avdO1OZ/vJ0ELo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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