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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3591f8d5194d78a557243f2d9e80cc0a654c2e7bccc013c0ceb6be746f75f4d9' 
  AND token = 'ctzkVeKATO+MVvJvkOUTQ/ygjSEyzXRvfk5VOqDJtPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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