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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc8b5f391f06afc1c974834131c18cacd4b214ac763f4bb4ba0958fcd7e4591' 
  AND token = 'fsHw9lzDONX2ssOkPScpPw18Z3zRVn91ulh7qAGq0sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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