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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '535a758e5645c1ef411a1fd60fa672ca0fe770dd566f14a14f7772bbf195c11c' 
  AND token = 'DW9H8sfk8JLIXUeGGrC+gNqPFruQrTiBYunadH1Fb4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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