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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f175b45280d9172d08bc61102b76448ce6988eca83a6aa30cfe3c363fc5f08aa' 
  AND token = 'gmhMs+pSwpWJ8yqoom8gxVeyolUtHptlQx+wPYHYv64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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