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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f434452c0ca704566d7d07c889a4d87b61fba1d8c5a7ddd5fedad610fa1f80' 
  AND token = '8YHzOVTLwMv1oo/9MEutdF5nMrAdGbPceYD1SxTGs00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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