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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4efe085e4c5820fc1a65e4e8abb482bc5dcc0ee224bd483a4bc684a4fae36d27' 
  AND token = 'EOuA2/C45fO35J/iU3b7Bkcna0r9mg9qQ9Wv+MI3+r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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