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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0706011b197bfc706d3788490d84cdda07eba2bc25d9da7261a99799dc903703' 
  AND token = 'CXGeExWUB8PjxVhQR+HkOW8jMdp81JraELSrf0uMxhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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