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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325da20290b7e7e0fc48ba694cdc41681c5cb45e8e99c2aa24682e9d9c6cf92c' 
  AND token = 'KV6rQW7vKAd1h5Io0xGigQs3gW1zutiKN62FaCp/csk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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