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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa92caa232c84f98359adc3420696027d26ecf7b745b0a0ee13576626bed4724' 
  AND token = 'USooHhpy4JHy39qNVdv4myWab48+0omdfh9usJZZdPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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