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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655b6e5b657e4874e11d2d20f3f23aca7d18ba5adf7fb5a437416b5b97a26f25' 
  AND token = 'r4hmb4lcaOekXIgAPBEMgYJp0w7iYu3GTEB3omA4rXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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