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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27395958d0c3435c13531e538554a33f38993279e13a4996c04330397c708b4a' 
  AND token = 'RhrTohxcSWvLUBeVgUMeJVlxF8eVUEiHhIB0tNMXa94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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