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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8247444524ef9414acc2a7b391db248535caadb98fe5b91b8d50a9f736171c' 
  AND token = 'c6B+hZshQkZAcGbno/KRbgzrAKI6bfYG91RHp5OfKdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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