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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c518e2c0658f967ad76828a1c9488e005bb7feb8c453f02e31e32133455bde' 
  AND token = 'msm/+MPSVPVvVDNMyMlq9f8XuSDzpSR4TQSwoMJNApQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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