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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e93c73e0719bee9144ecbc3937807820df5d1f79525593754bf0ccd9eb13ae' 
  AND token = 'e3uGdKcDB+mDOw48EWP7v1kIWKiSR1otbwv0CIe/BLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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