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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aeb502301a76a3eea884c7f9ee52a839db0beb7c6845c6924172135e066a399' 
  AND token = 'N1H9bViKfNUEMymiBhRaFUbT7TDCIjgrtoraHY553XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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