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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd5ed3e04901f46940a3da3197bd6a03e0ee3af82556317e4b7e5df2ef7436c' 
  AND token = 'ZWe2Gu39HL5hezVVWsLlMo/qqFBtotozTezWhYqAk7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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