SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c1855b3f73b58f3653c0ff3e6c27e57152ea894c8739948a9ecb6ade95fdee' 
  AND token = 'uglhWvujVAZJz/2ZuLRTcoI5uAdIna8/RVKMCPJFEos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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