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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf1f682c0b78b62a9c771abf41a34e3f0f19d06e81c589d376150f7529cc349' 
  AND token = 'osJjzePd8p5pJhbNlXmnHH7J8XSQjmjfDaizyRiWK+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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