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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecabf7bc320de4fdadf3c0c11d7303577433313597c1e588fd4640c32c893c93' 
  AND token = 'R5JdfvWmIY6qnxHtL2HI4p25uoEA7w3doCZT7sfngRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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