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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314d1a546a3428d0cde9c9b5ca1da9b050481d82907f49a8e335c94a75abcef0' 
  AND token = 'SmJkCpJR8peDr4sy0vpBCm65PFCi5Ggyqt7ch7tKX54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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