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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f5725c5122325aabebfb34cafb19594806c83565595e7a3d6872b40c44a393' 
  AND token = '1svmfLl8ckXkZ4Im9M4indRPw2k+nX3ipHZDffSgkpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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