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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83afec699848dce66b9faa20aeb3445d9db0fdf0035751cc31d3f258d5c5dcb' 
  AND token = 'F7ysqX8meRKlw+53SjeV4wfvGk6nVYcbICE/mLbaevk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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