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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c26f2e80868a241b6865467f4496e9f6f34845a4faa40fdfc86ed46aad7997' 
  AND token = 'f7lbHK3xRpUPCY3wVz1pSsFR+5ylAI45M4QE5O1vNg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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