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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc36d00b5e4ffd1a7c888a89eaa6d0a33b69f16acb3cb9441640f669fffe3fd3' 
  AND token = 'kUdJ15DDCd6tOFb1J//9hYKIA8Q8F7C92xpQtD/q2nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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