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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f90b020520ef91dd28c3b2515ee1facd337c799917e51368d5a0c6c202845bd' 
  AND token = 'rRbck4v6rVCfSrQyi9Pr3GQO2TrpIOR8XLfHFLt62bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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