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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0870a0735c6747f14b37c16f656964c75e199818d96f596a16f4176059f18248' 
  AND token = '7nMA/tTeuJMFddoYr5mu8wVg1lXOAgE3/dIXN0twwuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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