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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5ebe53fd211d0e02ad06c743b7d3c3c0a8f1781dc1c9b158dc97237763b061' 
  AND token = 'AYSTVGMash3hJQYxYQ9VJ9P/c3Auh1bGD6c9NNxASLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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