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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe112d4528c1c9736dcecf6f49884d0f9bbdd9e181036460c43bb72e5872050' 
  AND token = 'DuraGXGDuPb3ENDk1Lv0La8fV1/r9D4L1q9lnRjKztE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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