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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3050ea2a2c455ae4b2f9f94ddec39c8910677ddfeadbd92239cdb9d09d7226dc' 
  AND token = 'Oy85pBbbiBYVBj5aB3iTcWcNL5Jf+nGWVywVs+e65Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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