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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229701f0be32fd9bd48068bc33fe8172b8958d7d8c854795a78b73a52244347c' 
  AND token = 'NDVs6dca/4v9lrt74EsBwEGaXO1Zv1XOXyNfCT+VyW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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