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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd2d42674d86929b58d3d1ae8ab8a9216d5f0374005f3409db19db908a1a173' 
  AND token = 'dcjJwXINAqnpQvzve0ya5+0dE1sP5/qrQIWynjHfTYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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