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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ee5b54d644988aa5660b8c0801731f0951db4626a579c93f0512a76a5028a9' 
  AND token = 'w7SCK/Qm8RB7FE9KtDK+4W9qheOEw/zO0n5Mqq34bzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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