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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc692cdaf6b55c4662ec777abc91ae7a59336c24b531899f2d6ade7e8f55fc48' 
  AND token = 'E0XQ/9mP+stV0oe6zST4TvezDwUIOutDXUY/dS0wPJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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